Sweet Secret of Heart Chocolate

After school, the girl is surrounded by a puzzle-like background, gently holding a heart-shaped chocolate between her fingers. Her cheeks are slightly flushed, and she sticks out her tongue a bit, imagining the sweet taste. This is a small adventure on Valentine's Day. Perhaps it's a secret moment where she savors the chocolate meant for someone else? As the pieces around her connect, her heart melts sweetly too. What story awaits?